What is the role of a ballast in fluorescent lights?
At the moment of the contact of the generator, the ballast produces about 800 volts of self-inductance voltage, which makes the lamp tube emit electrons, and the lamp tube normally lights up, and the current is restricted
To produce high pressure, the lamp tube 2, the lamp will be the effect of the ballast (limiting the flow), so that the lamp tube will work normally. When the fluorescent lamp after access circuit, electric fluorescent starter began to glow discharge between two electrodes, the bimetallic strip heat expansion and contact with the static contact extremely, so the power supply, ballast, filament and electric fluorescent starter constitute a closed loop, current filament preheating, 1-3 seconds when the heating time, electric fluorescent starter of glow discharge between two electrodes, then the bimetallic strip cooling and static contact is extremely disconnected, when two electrodes disconnect instantly, the current in the circuit suddenly disappeared, so ballast produces a high voltage pulse, and it has to do with power superposition, on both ends of the tube and, make the inert gas ionization inside the tube caused by arc discharge, in the process of normal light, ballast self-induction is still stable circuit in current role.
Inductive ballast is started with the role of the starter on both ends of tube to produce high voltage, discharge light fluorescent tube and then disconnect the starter, the power supply from the ballast to the tubes provide stable working current, keep the lamp light. Electronic rectifier is through the electronic circuit of self-excited oscillation gas lighting lamp, fluorescent lamp tube high voltage breakdown, and then by maintaining a lamp luminous power electronic circuit, can achieve low voltage start and little damage to the tube. And effective prolong lamp life
Current-limiting ballast work. High pressure startup. Light bulb. Judge a ballast resistance is good or bad it is a test. 2 it is to test the working current
It is the function of instantaneous high pressure generated at startup Air breakdown in order to tubes So the conductive When the lamp normal light It have played an important role in current limit
